Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc89f6b1a9ee1ff6…

MALICIOUS

PDF

40.1 KB Created: 2020-08-13 18:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f9af1e8f27267dfe493573e7249fe24 SHA-1: a3cff608cbfea73608c2fc2abb9db5aa259af7a3 SHA-256: dc89f6b1a9ee1ff6592634ff838408a503102169b7c80e3095425eebde395b7b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded URLs, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to distribute malicious content or engage in SEO abuse. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the extensive link farm and the malicious redirector strongly suggest a phishing or content distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/wb?keyword=famous%20blue%20raincoat%20tab%20pdf
    • http://vogaduze.maplegrovepta.org/uploads/1/3/1/3/131398455/a247840cf84d8.pdf
    • http://wurunogi.mosaicartbyabbe.com/uploads/1/3/1/4/131482975/701e09.pdf
    • http://files.speedcubereview.com/uploads/1/3/0/9/130969942/dakigupujebefinu.pdf
    • http://files.simplyskatingconsignment.com/uploads/1/3/1/4/131438128/2306840.pdf
    • http://lodefa.gener8tionalconnections.com/uploads/1/3/2/7/132712615/vizunarutelexib_jipiluwekaj.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/6003/files/34788739428.pdf
    • https://cdn.shopify.com/s/files/1/0432/4094/7880/files/gefajet.pdf
    • https://cdn.shopify.com/s/files/1/0437/0753/1432/files/serarumuzabewivuper.pdf
    • https://cdn.shopify.com/s/files/1/0440/0994/7301/files/zitifirawuvasagu.pdf
    • https://cdn.shopify.com/s/files/1/0443/1269/0844/files/easy_happy_birthday_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0430/6403/3429/files/72546613095.pdf
    • https://cdn.shopify.com/s/files/1/0434/9237/6741/files/zevusudo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1081/8201/files/barayti_ng_wika_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/3224/8469/files/defensins_antimicrobial_peptides_of_innate_immunity.pdf
    • https://cdn.shopify.com/s/files/1/0437/6854/5441/files/51592668030.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/morevixapeniguwebavudam.pdf
    • https://cdn.shopify.com/s/files/1/0434/0075/7398/files/remezotekip.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/lemoxaxoza.pdf
    • https://cdn.shopify.com/s/files/1/0437/9171/2405/files/mixobafakefizexirubomav.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ba1.bin
9d22f814c9421619cdd6e9b3c9f2b1921a8b36476c3d2d39e3965c80b7538c63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BA1 5396 bytes
font_01_sfnt_off00006de6.bin
a3ac60ad24e24b91f67f494c91c5337fc537c7275aae04942b61ba4a51041d09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE6 10912 bytes

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